Beyma 4FR40

Full-range

Nominal diameter4″ / 100 mm
Resonance92 Hz
Q factor0.89
Sensitivity86.1 dB
Linear excursion± 3 mm
Program Power80 W
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply
  • Sensitivity (1W, 1m, infinite baffle) SPL1W 86.1dB
  • Frequency response 100 - 20000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 92Hz
  • Mechanical quality factor QMS 11.30
  • Electrical quality factor QES 0.96
  • Total quality factor QTS 0.89

Large signal parameters

  • Maximum linear excursion xmax 3mm
  • Air volume displaced at xmax VD 17cm³
  • Power handling P 40W
  • Program power Pmax 80W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 6.4Ω
  • Inductance (1kHz) LE 0.2mH
  • VC Diameter 20.3mm
  • Winding height HVC 7.7mm

Magnet

  • Force factor Bl 4.2N/A
  • Motor constant Bl/√RE 1.66N/√W
  • Air gap height HAG 5mm

Diaphragm

  • Effective diameter 84mm
  • Effective area SD 55cm²
  • Moving mass MMS 4.4g
  • Moving mass (without air load) MMD 4.1g

Suspensions

  • Stiffness KMS 1.5N/mm
  • Compliance CMS 668µm/N
  • Equivalent volume to the compliance VAS 2.8L
  • Mechanical resistance RMS 0.23N·s/m

Dimensions

  • Nominal diameter 4
  • 100mm
  • Overall diameter 118mm
  • Baffle cutout diameter 92mm
  • Overall depth 60mm
  • Volume occupied by the driver (estimated) 0.17L
  • Net weight 0.55kg
Beyma 4FR40 SPL & Impedance
Beyma 4FR40 Dimensions

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